The Reservoir of Ullíbarri-Gamboa is located next to the villages Ullíbarri-Gamboa, Nanclares de Gamboa and Arroyabe in Álava, Basque Country, Spain. It has a volume of 146 m³ and this makes it the biggest reservoir in the Basque Country. The area of land all around the reservoir is called Arrazua-Ubarrundia and it is famous for its routes for tracking.
The Gamboa valley was the place where nowadays is the reservoir. In this valley were villages like Azua, Garaio, Landa, Larrinzar... and much more. All this villages were affected by the works and they could not do anything against it. Mendizabal, Landa and Zuazo de Gamboa were completely flooded under the water and other villages were also affected but not as bad as there. The people who lived in this villages lost their homes, properties and lands, consequently they all moved to other places to live. Nowadays, in summer, when the water level is low, all these ruins can be seen down the water. The fauna and the flora were also affected by these changes. Some plants were broken and drowned by the water while others adapted to the aquatic life and some seaweed developed. With the time this ecosystem has turned in an aquatic ecosystem and it became a Ramsar Site and part of the Natura 2000 network.
This island provides little cabins to stay all around the island. It may be famous for its large number of rabbits and it is also called the island of the rabbits. It offers the possibility to practice many aquatic sports, such as windsurfing, sailing, rowing and canoeing.
It is an island next to Zuhatza which does not provide as much as Zuhatza island does.
Orenin
Before the reservoir was constructed, it was a village that could be accessible by car, but after the reservoir it ended up being an isolated small island. Nowadays it is abandoned but it turned up to be a place where bird colonies stay during the summer season.
Supply
Currently the reservoir supplies water for a 50% of the Basque Country. In the village of Ullíbarri-Gamboa they pump more than 800 l/s to provide to Vitoria-Gasteiz. Besides, there is a hydroelectric energy station, next to Vizcaya, which works with the help of this reservoir. Furthermore, it helps the Zadorra river not to alter its course when the water level is very high, it can evacuate 570 m³ per second.
The Garaio Provincial Park is located next to the Zadorra river, forming a small peninsula. It has many forests that makes it easy to have a close bond with nature. It is accessible by car and has many ruts which can be done cycling or walking. However, it is next to Garaio, a village in which cottages can be rented and it offers a relaxing stay in the area.
Landa Provincial Park
The Landa Provincial Park is next to the village Landa, 17 km away from Vitoria-Gasteiz. It is on northeast of the reservoir and it offers a small beach to stay at. Most inhabitants from Vitoria come here on summer and the old railway tracks are now wide ways for bicycles.
Mendijur Ornithological Park
The Mendixur area is place where the surface water zone is impressive. It has 70 ha of extension and it is commonly frequented by people who like nature and would like to know more about the ecosystem of this place. Moreover, the animal that abound are the birds and depending on the season the type of birds go changing. It is a part of the netNatura 2000. In Euskal Herria, this passion for the birds has led to a new hobby called birding, which is popular in some other countries of Europe.
